I'm sad that we miss two hundred years of history during the 30 verses of Omni. I'm thankful that Amaleki was so faithful.
The population growth rate in the year 2000 was about 1.5%. I tried to find the population growth rate of the Nephites, Mulekites and Lamanites and ran across a bunch of essays written by BYU professors. I thought it was interesting that they explain such explosive population growth by not assuming that the seed of Lehi and the Mulekites were the only inhabitants of the promised land. If you consider the process of assimilating other cultures into the Nephite culture, it can open your eyes to the importance of continuing revelation, missionary work and friendship among societal classes.
